Table 1.

Description of parameters used in the study with the measurement plane

Parameter	Description	Plane
FC1	Distance between fundus of the internal acoustic meatus and the most anterior point of posterior wall of FCa	Horizontal
A1-2	Angle of the first curve of FC	Horizontal
FC2	Distance between the most anterior and the most posterior point of posterior wall of FC	Sagittal
FC1W	Calculated as an average from 2 auxiliary parameters (FC1w1 and FC1w2) measured between the bony walls of FC at the proximal and distal region of the labyrinthine portion	Horizontal
FC2W	Calculated as an average from 2 auxiliary parameters (FC2w1 and FC2w2) measured between the bony walls of FC at the proximal and distal region of the tympanic portion	Horizontal
IAM	Distance between inferior part of opening of the internal acoustic meatus and fundus of the meatus	Horizontal
BCT	The shortest distance between medial wall of labyrinthine portion of FC and the basal cochlear turn	Horizontal
LSC	The shortest distance between posterior wall of tympanic portion of FC and the lateral semicircular canal	Sagittal
BD	The greatest distance measured between external tables of both temporal squamae at the level of fundus of IAM	Horizontal

FC fallopian canal, CT computed tomography, IAM internal acoustic meatus, ^a anterior wall from the aspect of the tympanic cavity (where the facial geniculum ends) was not visible in micro-CT scans